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Multiphase Flow Simulation of Subcooled Boiling Using the N-Phase Approach in TransAT

[+] Author Affiliations
S. Thomas

Ascomp USA Inc., Cambridge, MA

C. Narayanan, D. Lakehal

Ascomp GmbH, Zurich, Switzerland

Y. Gong

Simpop Information Technology Co., Shanghai, China

Paper No. ICONE21-15339, pp. V003T10A015; 7 pages
  • 2013 21st International Conference on Nuclear Engineering
  • Volume 3: Nuclear Safety and Security; Codes, Standards, Licensing and Regulatory Issues; Computational Fluid Dynamics and Coupled Codes
  • Chengdu, China, July 29–August 2, 2013
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 978-0-7918-5580-5
  • Copyright © 2013 by ASME


In Pressurized Water Reactors (PWR), convective boiling occurs at the heated walls, which are superheated while liquid bulk is subcooled at a given operating pressure. The physical modeling of the phenomenon is complex, as it requires consideration of phase change and turbulence. The combinations of Reynolds-Averaged Navier Stokes (RANS) and wall boiling models have found moderate success in the past. Succesful modeling depends on the nature of the problem and its operating conditions, the manner of the model implementation and the quality of the computational platform. In the present work recent developments executed in the TransAT code for subcooled boiling are demonstrated. To better capture the phase change, the modified mixture approach is employed where the temperature of the N-phases are resolved separately. This method has been more suitable for phase-change problems, when compared to a single mixture temperature. To check the validity of the modeling, results are evaluated against the DEBORA experiments carried out at CEA Grenoble.

Copyright © 2013 by ASME



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